In a sample of seven cars, each car was tested for nitrogen-oxide emissions ( in grams per mile) and the following results were obtained: 0.06, 0.17, 0.08, 0.14, 0.11, 0.08, 0.17. Assuming that this sample is representative of the cars in use, construct a 98% confidence interval estimate of the mean amount of nitrogen oxide emissions for all cars. If the EPA requires that nitrogen-oxide emissions be less than 0.165 g/mi, can we safely conclude that this requirement is being met? What is the confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars?

__ g/mi < u < __ g/mi ??

Can we safely conclude that the requirement that nitrogen-oxide emissions be less than 0.165g/mi is being met?

a) Yes, we can definitely conclude that the requirement is met for all cars

b) Yes, because the confiedence interval contains 0.165g/mi.

c) No, it is possible that the requirement is being met, but it is also very possible that the mean is not less than 0.165g/mi.

d) No, because the confidence interval does not contain 0.165g/mi.